Resettable hydraulic layer-changing switch

Abstract

The utility model discloses a resettable hydraulic layer change switch which comprises a central pipe, an upper connector, a piston sleeve, a lower connector and an outer cylinder, the upper connector and the lower connector are respectively communicated with two ends of the central pipe, the piston sleeve is sleeved outside the central pipe, the outer cylinder is sleeved on the piston sleeve, and a track groove is arranged on the outer wall of the central pipe. A piston is slidably arranged in a cavity between the rail groove and the annular blocking block, a rail nail is slidably connected into the rail groove and connected with the piston, the rail groove comprises a short rail groove, a long rail groove and a high-pressure rail groove, and the short rail groove, the long rail groove and the high-pressure rail groove are sequentially arranged outwards from the position close to the top of the rail nail. An output liquid flow channel is annularly arranged between the piston sleeve and the outer cylinder, the output liquid flow channel is in an opening / closing state along with the position change of the piston, and the reset mechanism is installed at the end, away from the annular plug block, of the piston. According to the utility model, the problems that the underground switching state of the hydraulic layer-changing switch is not clear and the extraction layer section cannot be correctly judged are solved.

Description

Technical Field

[0001] This utility model relates to the field of oilfield layer replacement and exploitation technology, and in particular to a resettable hydraulic layer replacement switch. Background Technology

[0002] In the later stages of oilfield development, especially in the later stages of water-injection oilfield production, as the formation water content changes, the stratigraphic division becomes increasingly refined, inter-layer conflicts become more prominent, and high and low water-bearing layers coexist. To understand the oil layers and stabilize oil production while controlling water, water-blocking operations are frequently conducted. Currently, the hydraulic layer-changing switch used in water-blocking tubing changes the switch's on / off state by injecting hydraulic pressure. However, due to factors such as dewaxing and well washing causing pressure buildup, surface pipeline leaks during pressure injection and layer-changing operations, and pump truck malfunctions, the downhole on / off state of the hydraulic layer-changing switch becomes unclear, making it impossible to accurately determine the produced layer, thus necessitating tubing string tripping operations. Utility Model Content

[0003] The purpose of this invention is to provide a resettable hydraulic layer-changing switch. When the hydraulic layer-changing switch is in an unclear state downhole and the produced section cannot be correctly determined, high hydraulic pressure is applied from the surface into the tool. The liquid enters the lower end face of the piston through the lower through hole of the central tube, and the piston moves upward in a controlled manner. At this time, the track pin moves upward in the track groove of the central tube and enters the highest point of the high-pressure track groove, and makes a corresponding circumferential movement. After the hydraulic pressure is released, under the action of the reset mechanism, the piston moves downward in a controlled manner, and the track pin returns to the initial long track groove, realizing a high-pressure reset to the original state. This solves the problem that the hydraulic layer-changing switch is in an unclear state downhole and cannot correctly determine the produced section.

[0004] To achieve the objective of this utility model, a resettable hydraulic layer-changing switch is provided, comprising: a central tube, an upper connector, a piston sleeve, a lower connector, and an outer cylinder. The upper connector and the lower connector are respectively connected to both ends of the central tube. The piston sleeve is fitted outside the central tube, with one end sealed to the upper connector and the other end sealed to the outer wall of the central tube via a ring plug. The outer cylinder is fitted outside the piston sleeve, with one end sealed to the lower connector and the other end sealed to the outer wall of the piston sleeve. A track groove is formed on the outer wall of the central tube, and a movable valve is slidably disposed in the cavity between the track groove and the ring plug. The piston is equipped with a stopper, a track pin slidably connected within the track groove, the track pin being connected to the piston, and the track groove including a short track groove, a long track groove, and a high-pressure track groove, the long track groove, the short track groove, and the high-pressure track groove being arranged sequentially outward from the top position of the track pin, the central tube having a central tube lower through hole on its side wall, the central tube lower through hole being connected to the cavity between the annular plug and the piston, the piston sleeve and the outer cylinder having an annular space for a production liquid flow channel, the production liquid flow channel being open / closed depending on the position of the piston, and also includes a reset mechanism, the reset mechanism being installed at the end of the piston away from the annular plug.

[0005] As a preferred embodiment of this utility model, the output liquid flow channel includes an external liquid inlet, a central tube upper through hole, a piston sleeve through hole, and a piston through hole. The external liquid inlet is located at the lower connector side end and connects to the cavity between the outer cylinder, the annular plug block, and the central tube. The central tube upper through hole is located on the side wall of the central tube, and the central tube upper through hole and the central tube lower through hole are spaced apart. The piston sleeve through hole is located on the side wall of the piston sleeve and is positioned corresponding to the central tube upper through hole. The piston sleeve through hole connects to the external liquid inlet and is radially located on the piston side wall.

[0006] As a preferred technical solution of this utility model, when the track pin is located in the long track groove, the piston through hole is misaligned and isolated from the through hole on the central tube and the through hole on the piston sleeve.

[0007] When the track pin slides to the short track groove, the piston through hole aligns with the through hole on the central tube and the through hole on the piston sleeve, forming a connecting flow channel.

[0008] As a preferred embodiment of this utility model, a one-way valve is installed inside the external liquid inlet. The one-way valve includes a pressure ring, which is installed between the external liquid inlet and the ring plug. A valve ball is installed between the pressure ring and the external liquid inlet. A valve ball compression spring is installed between the valve ball and the pressure ring. A valve seat is provided on the inner wall of the external liquid inlet. The inner wall of the valve seat near the valve ball end is configured with a conical structure. The conical structure fits against the outer wall of the valve ball to form a metal rigid seal.

[0009] As a preferred embodiment of this utility model, the reset mechanism includes a compression spring, which is disposed between the track groove and the piston. An adjustment ring is disposed between the compression spring and the piston. One end of the track pin is connected to the piston through a piston connecting cylinder. The other end of the track pin is fixedly connected to a rotating ring, and a rotating ring pressure cap is fixedly connected to the outside of the rotating ring. The track pin and the rotating ring rotate circumferentially relative to the central tube.

[0010] As a preferred embodiment of this utility model, the short rail groove and the long rail groove are connected by a transition slope, and the rail stud is converted between the short rail groove and the long rail groove through the transition slope.

[0011] As a preferred embodiment of this utility model, the piston is configured as an annular piston, the piston is sleeved between the central tube and the piston sleeve, and the outer and inner walls of the piston are provided with multiple sets of sealing rings, and the piston through hole is opened between two sets of sealing rings.

[0012] As a preferred embodiment of this utility model, the outer wall of the annular plug is flush with the outer wall of the piston sleeve, and an annular space is provided between the outer wall of the piston sleeve and the inner wall of the outer cylinder. The through hole of the piston sleeve is connected to the external liquid inlet through the annular space.

[0013] Compared with the prior art, this utility model provides a resettable hydraulic layer-changing switch, which has the following advantages:

[0014] When the hydraulic layer-changing switch is in an unclear state downhole and the produced section cannot be correctly determined, the hydraulic pressure is increased from the surface into the tool. The fluid enters the lower end face of the piston through the central tube's lower through-hole, and the piston moves upward in a controlled manner. At this time, the rail pin moves upward in the rail groove of the central tube and enters the highest point of the high-pressure rail groove, and makes a corresponding circumferential movement. After the hydraulic pressure is released, under the action of the reset mechanism, the piston moves downward in a controlled manner, and the rail pin returns to the initial long rail groove, realizing a high-pressure reset to the original state. This solves the problem of the hydraulic layer-changing switch being in an unclear state downhole and unable to correctly determine the produced section.

[0015] During normal production, when a low hydraulic pressure is applied to the tool, the fluid enters the lower end face of the piston through the lower through-hole on the central tube. The piston compresses the compression spring and moves upward in a controlled manner. At this time, the track pin moves upward in the track groove of the central tube but does not enter the high-pressure track groove, and makes a corresponding circumferential movement. After the hydraulic pressure is released, the piston moves downward in a controlled manner under the action of the compression spring, and the track pin switches between the short track groove and the long track groove. The piston through-hole on the piston corresponds to or avoids the piston sleeve through-hole and the through-hole on the central tube, realizing the opening or closing of the resettable hydraulic layer-changing switch. When in the open state, the corresponding formation produced fluid enters the central tube through the one-way valve on the lower connector, the annulus between the outer cylinder and the central tube, the annulus between the outer cylinder and the piston sleeve, the piston sleeve through-hole, the piston through-hole, and the through-hole on the central tube.

[0016] When the tool is filled with high hydraulic pressure, the liquid enters the lower end face of the piston through the central tube through the lower through hole on the central tube. The piston compresses the compression spring and moves upward in a controlled manner. At this time, the rail pin moves upward in the rail groove of the central tube and enters the highest point of the high pressure rail groove, and makes a corresponding circumferential movement. After the hydraulic pressure is released, under the action of the compression spring, the piston moves downward in a controlled manner, and the rail pin returns to the initial long rail groove, realizing the reset to the original state. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the reset mechanism structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the single-flow valve structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the unfolded track groove of this utility model.

[0021] 1 is the central tube, 2 is the upper connector, 3 is the piston sleeve, 4 is the lower connector, 5 is the outer cylinder, 6 is the ring plug, 7 is the piston, 8 is the upper through hole of the central tube, 9 is the lower through hole of the central tube, 10 is the through hole of the piston sleeve, 11 is the through hole of the piston, 12 is the reset mechanism, 13 is the check valve, 14 is the external liquid inlet, 15 is the track groove, 16 is the compression spring, 17 is the adjusting ring, 18 is the track pin, 19 is the piston connecting cylinder, 20 is the rotating ring, 21 is the rotating ring pressure cap, 22 is the short track groove, 23 is the long track groove, 24 is the high pressure track groove, 25 is the pressure ring, 26 is the valve ball, 27 is the valve ball compression spring, and 28 is the valve seat. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-4 This utility model provides a resettable hydraulic layer-changing switch, comprising: a central tube 1, an upper connector 2, a piston sleeve 3, a lower connector 4, and an outer cylinder 5. The upper connector 2 and the lower connector 4 are respectively connected to both ends of the central tube 1. The piston sleeve 3 is sleeved outside the central tube 1, with one end sealed to the upper connector 2 and the other end sealed to the outer wall of the central tube 1 via an annular plug 6. The outer cylinder 5 is sleeved outside the piston sleeve 3, with one end sealed to the lower connector 4 and the other end sealed to the outer wall of the piston sleeve 3. A track groove 15 is formed on the outer wall of the central tube 1, and a piston 7 is slidably disposed in the cavity between the track groove 15 and the annular plug 6. The piston 7 is connected to a track pin 18. The track groove 15 includes a short track groove 22, a long track groove 23, and a high-pressure track groove 24. The long track groove 23, the short track groove 22, and the high-pressure track groove 24 are arranged outward from the top of the track pin 18. The side wall of the central tube 1 has a central tube lower through hole 9, which connects the cavity between the annular block 6 and the piston 7. A production liquid flow channel is annularly arranged between the piston sleeve 3 and the outer cylinder 5. The production liquid flow channel is open / closed as the position of the piston 7 changes. The piston 7 also includes a reset mechanism 12, which is installed at the end of the piston 7 away from the annular block 6.

[0024] In one embodiment of this utility model, the output liquid flow channel includes an external liquid inlet 14, a central tube upper through hole 8, a piston sleeve through hole 10, and a piston through hole 11. The external liquid inlet 14 is opened at the side end of the lower connector 4 and connects the cavity between the outer cylinder 5, the annular plug 6, and the central tube 1. The central tube upper through hole 8 is opened on the side wall of the central tube 1. The central tube upper through hole 8 and the central tube lower through hole 9 are spaced apart. The piston sleeve through hole 10 is opened on the side wall of the piston sleeve 3 and is positioned corresponding to the central tube upper through hole 8. The piston sleeve through hole 10 is connected to the external liquid inlet 14. The piston through hole 11 is radially opened on the side wall of the piston 7.

[0025] In one embodiment of this utility model, when the track pin 18 is located in the long track groove 23, the piston through hole 11 is misaligned and isolated from the through hole 8 on the central tube and the through hole 10 on the piston sleeve.

[0026] When the track pin 18 slides to the short track groove 22, the piston through hole 11 aligns with the through hole 8 on the central tube and the through hole 10 on the piston sleeve, forming a connecting flow channel.

[0027] In one embodiment of this utility model, a one-way valve 13 is installed inside the external liquid inlet 14. The one-way valve 13 includes a pressure ring 25, which is installed between the external liquid inlet 14 and the ring block 6. A valve ball 26 is installed between the pressure ring 25 and the external liquid inlet 14. A valve ball compression spring 27 is installed between the valve ball 26 and the pressure ring 25. A valve seat 28 is provided on the inner wall of the external liquid inlet 14. The inner wall of the valve seat 28 near the valve ball 26 is configured with a conical structure. The conical structure fits against the outer wall of the valve ball 26 to form a metal rigid seal.

[0028] In one embodiment of this utility model, the reset mechanism 12 includes a compression spring 16, which is disposed between the track groove 15 and the piston 7. An adjusting ring 17 is disposed between the compression spring 16 and the piston 7. One end of the track pin 18 is connected to the piston 7 through the piston connecting cylinder 19, and the other end of the track pin 18 is fixedly connected to a rotating ring 20. A rotating ring pressure cap 21 is fixedly connected to the outside of the rotating ring 20. The track pin 18 and the rotating ring 20 rotate circumferentially relative to the central tube 1.

[0029] In one embodiment of this utility model, the short rail groove 22 and the long rail groove 23 are connected by a transition slope, and the rail pin 18 is converted between the short rail groove 22 and the long rail groove 23 through the transition slope.

[0030] In one embodiment of the present invention, the piston 7 is configured as an annular piston, the piston 7 is sleeved between the central tube 1 and the piston sleeve 3, and the outer wall and inner wall of the piston 7 are provided with multiple sets of sealing rings, and the piston through hole 11 is opened between two sets of sealing rings.

[0031] In one embodiment of this utility model, the outer wall of the annular plug 6 is flush with the outer wall of the piston sleeve 3, and an annular space is provided between the outer wall of the piston sleeve 3 and the inner wall of the outer cylinder 5. The piston sleeve through hole 10 is connected to the external liquid inlet 14 through the annular space.

[0032] In one embodiment of this utility model, a sealing ring assembly is provided at the connection between the central tube 1, the upper connector 2, the piston sleeve 3, the lower connector 4 and the outer cylinder 5.

[0033] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A resettable hydraulic floor-changing switch, characterized in that, include: The central tube (1), upper connector (2), piston sleeve (3), lower connector (4), and outer cylinder (5) are connected to the two ends of the central tube (1), respectively. The piston sleeve (3) is fitted outside the central tube (1), with one end sealed to the upper connector (2) and the other end sealed to the outer wall of the central tube (1) through a ring plug (6). The outer cylinder (5) is fitted outside the piston sleeve (3), with one end sealed to the lower connector (4) and the other end sealed to the outer wall of the piston sleeve (3). A track groove (15) is provided on the outer wall of the central tube (1). A piston (7) is slidably arranged in the cavity between the track groove (15) and the ring plug (6). A track pin (18) is slidably connected in the track groove (15). The track pin (18) is connected to the piston (7). The track groove (15) includes a short track groove (22), a long track groove (23), and a high-pressure track groove (24). The long track groove (23), the short track groove (22), and the high-pressure track groove (24) are arranged outward from the top position of the track pin (18). The side wall of the central tube (1) is provided with a central tube lower through hole (9). The central tube lower through hole (9) is connected to the cavity between the ring block (6) and the piston (7). A production liquid flow channel is provided annularly between the piston sleeve (3) and the outer cylinder (5). The production liquid flow channel is in an open / closed state as the position of the piston (7) changes. It also includes a reset mechanism (12). The reset mechanism (12) is installed at the end of the piston (7) away from the ring block (6).

2. The resettable hydraulic floor-changing switch according to claim 1, characterized in that: The output liquid flow channel includes an external liquid inlet (14), a central tube upper through hole (8), a piston sleeve through hole (10), and a piston through hole (11). The external liquid inlet (14) is opened at the side end of the lower connector (4). The external liquid inlet (14) connects the cavity between the outer cylinder (5), the ring block (6), and the central tube (1). The central tube upper through hole (8) is opened on the side wall of the central tube (1). The central tube upper through hole (8) and the central tube lower through hole (9) are spaced apart. The piston sleeve through hole (10) is opened on the side wall of the piston sleeve (3). The piston sleeve through hole (10) is positioned corresponding to the central tube upper through hole (8). The piston sleeve through hole (10) is connected to the external liquid inlet (14). The piston through hole (11) is radially opened on the side wall of the piston (7).

3. A resettable hydraulic floor-changing switch according to claim 2, characterized in that: When the track pin (18) is located in the long rail groove (23), the piston through hole (11) is misaligned and isolated from the through hole (8) on the central tube and the through hole (10) on the piston sleeve; When the track pin (18) slides to the short track groove (22), the piston through hole (11) aligns with the through hole (8) on the central tube and the through hole (10) of the piston sleeve to form a connecting flow channel.

4. A resettable hydraulic floor-changing switch according to claim 2, characterized in that: A one-way valve (13) is installed inside the external liquid inlet (14). The one-way valve (13) includes a pressure ring (25). The pressure ring (25) is installed between the external liquid inlet (14) and the ring plug (6). A valve ball (26) is installed between the pressure ring (25) and the external liquid inlet (14). A valve ball spring (27) is installed between the valve ball (26) and the pressure ring (25). A valve seat (28) is provided on the inner wall of the external liquid inlet (14). The inner wall of the valve seat (28) near the valve ball (26) is set as a conical structure. The conical structure fits against the outer wall of the valve ball (26) to form a metal rigid seal.

5. A resettable hydraulic floor-changing switch according to claim 1, characterized in that: The reset mechanism (12) includes a compression spring (16), which is disposed between the track groove (15) and the piston (7). An adjustment ring (17) is disposed between the compression spring (16) and the piston (7). One end of the track pin (18) is connected to the piston (7) through the piston connecting cylinder (19). The other end of the track pin (18) is fixedly connected to a rotating ring (20), and a rotating ring pressure cap (21) is fixedly connected to the outside of the rotating ring (20). The track pin (18) and the rotating ring (20) rotate circumferentially relative to the central tube (1).

6. A resettable hydraulic floor-changing switch according to claim 1, characterized in that: The short rail groove (22) and the long rail groove (23) are connected by a transition slope, and the rail stud (18) is converted between the short rail groove (22) and the long rail groove (23) through the transition slope.

7. A resettable hydraulic floor-changing switch according to claim 2, characterized in that: The piston (7) is configured as an annular piston. The piston (7) is sleeved between the central tube (1) and the piston sleeve (3). The outer and inner walls of the piston (7) are provided with multiple sets of sealing rings, and the piston through hole (11) is opened between two sets of sealing rings.

8. A resettable hydraulic floor-changing switch according to claim 2, characterized in that: The outer wall of the annular plug (6) is flush with the outer wall of the piston sleeve (3), and an annular space is provided between the outer wall of the piston sleeve (3) and the inner wall of the outer cylinder (5). The piston sleeve through hole (10) is connected to the external liquid inlet (14) through the annular space.

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